{"id":"CVE-2026-89687","revision":"d019718b0af6469aaa7307b1bb3fd8de","records":[{"revision":"d019718b0af6469aaa7307b1bb3fd8de","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89687","aliases":[],"title":"nfsd: ensure nfsd_file_do_acquire() does not use a non-opened file","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: ensure nfsd_file_do_acquire() does not use a non-opened file\n\n->atomic_open is permitted to return success without actually opening\nthe file.  It indicates this by calling finish_no_open().\nThis means dentry_create() can return a file which hasn't been opened.\nThis is extremely unlikely as ->atomic_open handlers typically\nuse finish_no_open() only for already existing files, and dentry_create()\nisn't called in that case, and the parent being locked should prevent\nraces.\n\nHowever out of an abundance of caution it seems wise to teach nfsd to\nonly use the file returned by dentry_create() if FMODE_OPENED is set,\nindicating that it has in fact been opened.","state":0,"publishedAt":"2026-09-11T19:46:08.63+00:00","modifiedAt":"2026-10-19T08:51:00.577+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/nfsd/filecache.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"64a989dbd144e0622371396461b11335459692d2\",\n                            \"lessThan\": \"a95a1cffacd0203100297001719160160f443dd6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"64a989dbd144e0622371396461b11335459692d2\",\n                            \"lessThan\": \"5859cc01fee06a2cd7458905a9593082fbab06e1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/nfsd/filecache.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"7.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"7.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/a95a1cffacd0203100297001719160160f443dd6","https://git.kernel.org/stable/c/5859cc01fee06a2cd7458905a9593082fbab06e1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89687","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89687","identifiers":["CVE-2026-89687"]},"retained":false,"historicalAffected":[]}],"coverage":[]}